I still have a haldex contoller and set of wheels left over from an mk1 S3 that I sold on. Have been considering a mk1 TT for quick commuting rather than using an A4 avant 4x4. Bearing in mind the S3 & TT share the same running gear. Would the handling characteristics be comparable after the usual upgrades....ie. remap, ARBs, Susp, poly bushes.....